If you are using those round dial gauges then you aren't getting an accurate reading of the temperature.

You need something digital to measure temps. I like to use the accurite thermometer/hygrometer combos. You can buy them at home depot, lowes, or walmart.

Until you can get your setup done properly, just leave the night time light on 24/7. The snake will be fine.

Also, you do need to upgrade your prey size or your snake will slowly starve to death. Hatchling ball pythons are offered hopper mice (larger than fuzzies) right out of the egg. After a few meals they move to small adult mice.